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Träfflista för sökning "WFRF:(Bengtsson C) srt2:(2020-2021);pers:(Ertel Dominik)"

Search: WFRF:(Bengtsson C) > (2020-2021) > Ertel Dominik

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1.
  • Kumar Maroju, Praveen, et al. (author)
  • Attosecond pulse shaping using a seeded free-electron laser
  • 2020
  • In: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 578
  • Journal article (peer-reviewed)abstract
    • Attosecond pulses are central to the investigation of valence- and core-electron dynamics on their natural timescales. The reproducible generation and characterization of attosecond waveforms has been demonstrated so far only through the process of high-order harmonic generation. Several methods for shaping attosecond waveforms have been proposed, including the use of metallic filters, multilayer mirrors and manipulation of the driving field. However, none of these approaches allows the flexible manipulation of the temporal characteristics of the attosecond waveforms, and they suffer from the low conversion efficiency of the high-order harmonic generation process. Free-electron lasers, by contrast, deliver femtosecond, extreme-ultraviolet and X-ray pulses with energies ranging from tens of microjoules to a few millijoules. Recent experiments have shown that they can generate subfemtosecond spikes, but with temporal characteristics that change shot-to-shot. Here we report reproducible generation of high-energy (microjoule level) attosecond waveforms using a seeded free-electron laser. We demonstrate amplitude and phase manipulation of the harmonic components of an attosecond pulse train in combination with an approach for its temporal reconstruction. The results presented here open the way to performing attosecond time-resolved experiments with free-electron lasers.
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2.
  • Maroju, Praveen K., et al. (author)
  • A Novel Attosecond Timing Tool for Free-Electron Laser Experiment
  • 2020
  • In: High Intensity Lasers and High Field Phenomena 2020. - 9781943580736
  • Conference paper (peer-reviewed)abstract
    • We demonstrate a novel timing tool for Free-Electron Lasers to determine the delay between an attosecond pulse train and infrared pulse with sub-optical-cycle resolu-. tion.
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3.
  • Maroju, Praveen Kumar, et al. (author)
  • Complex attosecond waveform synthesis at fel fermi
  • 2021
  • In: Applied Sciences (Switzerland). - : MDPI AG. - 2076-3417. ; 11:21
  • Journal article (peer-reviewed)abstract
    • Free-electron lasers (FELs) can produce radiation in the short wavelength range extending from the extreme ultraviolet (XUV) to the X-rays with a few to a few tens of femtoseconds pulse duration. These facilities have enabled significant breakthroughs in the field of atomic, molecular, and optical physics, implementing different schemes based on two-color photoionization mechanisms. In this article, we present the generation of attosecond pulse trains (APTs) at the seeded FEL FERMI using the beating of multiple phase-locked harmonics. We demonstrate the complex attosecond waveform shaping of the generated APTs, exploiting the ability to manipulate independently the amplitudes and the phases of the harmonics. The described generalized attosecond waveform synthesis technique with an arbitrary number of phase-locked harmonics will allow the generation of sub-100 as pulses with programmable electric fields.
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  • Result 1-3 of 3

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